Mermaid costume



FIG. 1 is a front perspective view of a mermaid costume showing my new design; the costume shown as worn by a human figure represented in broken lines which form no part of the claimed design;

FIG. 2 is another front perspective view thereof of FIG. 1; the broken lines representing the human figure show the costume being worn and form no part of the claimed design;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof; the right side view being a mirror image thereof;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for a mermaid costume, as shown and described. 